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OOP raster isn't available as an option in cc_unittests, except for
Vulkan where it is enabled by default. GPU raster relies on GL, and
shouldn't be used with Vulkan.

Make the difference between GPU raster and OOP raster options explicit,
and clarify some of the messaging which mentions Vulkan and GPU raster.

Bug: 1092945
Change-Id: I1d54cf8586daea3a485be8f492d59ee4500e6007
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2240130
Commit-Queue: Sean Gilhuly <sgilhuly@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#787844}